There is a spot near me near a local college that is a worthless dead zone for data.

The signal is terrible, but it’s there. You can talk on the phone or send texts.

Surfing is horrible. At times you get great speeds. Two seconds later it feels like slow dial up. Really that’s what it feels like most of the time, any kind of speed is the anomaly.

As said in other comments, very few apps actually handle this well. They seem to expect that you either have a good connection or nothing.

It’s been like that for a decade plus. I assume it’s just overloaded and will never be fixed.